Describe with neat sketch the arc extinction in SF6 circuit breakers.

State the necessity of synchroscope and with neat sketch explain its working.
Answer : ### Necessity of a Synchroscope A **synchroscope** is an important device used to measure and indicate the **synchronization** of the speed, frequency, and phase of an incoming alternator (generator) ... generator is in sync with the grid, and the circuit breaker can be closed to connect them....

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With the neat sketch explain working of Dynamometer type wattmeter.

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With neat sketch of PMMC instrument explain its working briefly.

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With neat sketch explain four modes of operation of a TRIAC.

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Explain the principle of operation of Doppler type ultrasonic flow meter with a neat labeled sketch.

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Explain the shackle type insulator with neat sketch.

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Illustrate with neat sketch the working of automatic power factor corrector as an energy conservation device.

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Explain with a neat sketch the Pilot wire protection scheme applied to transmission line.

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Explain the differential protection scheme for busbars with a neat sketch.

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Explain with a neat sketch fault bus protection scheme.

Explain with a neat sketch fault bus protection scheme.
Answer : **Fault Bus Protection Scheme** A fault bus protection scheme is used to detect and isolate faults occurring on a busbar in electrical power systems. A busbar is a central connection ... widespread system disturbances and ensures continuity in the operation of other parts of the electrical network....

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With neat sketch, explain working of directional overcurrent relay.

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Explain the working principle of transformer dimmers with the help of a neat sketch.

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Explain the different types of DC motors with a neat sketch.

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With neat sketch state the working principle of Star-Delta starter.

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Explain working of vertical break isolator with neat sketch.

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Explain the working of a drinking water cooler with a neat sketch.

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Why is SF6 used in breakers?

Why is SF6 used in breakers?
Answer : SF6 (sulfur hexafluoride) is used in circuit breakers primarily because of its excellent insulating and arc-quenching properties. Here's why it's ideal for breakers: 1. **High ... essential material for modern electrical breakers in power grids, ensuring they perform safely and effectively....

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Describe emergency lighting system with neat diagram.

Describe emergency lighting system with neat diagram.
Answer : ### Emergency Lighting System An **emergency lighting system** is designed to provide illumination in the event of a power failure or when the normal lighting system is not functioning. These ... buildings of all sizes, especially in places like schools, hospitals, hotels, and office buildings....

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Describe the construction and operation of the Buchholz relay with a neat labeled diagram.

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Describe the working of an HRC fuse with a neat diagram.

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Describe the working of synchronous reluctance motor with the help of neat diagram.

Describe the working of synchronous reluctance motor with the help of neat diagram.
Answer : ### Working of Synchronous Reluctance Motor (SynRM) A **Synchronous Reluctance Motor (SynRM)** is a type of electric motor that operates on the principle of reluctance, similar to a ... certain applications, though it does have some limitations in terms of starting torque and power density....

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Describe spot welding and projection welding with neat sketches.

Describe spot welding and projection welding with neat sketches.
Answer : ### Spot Welding **Spot welding** is a type of resistance welding used to join two or more metal sheets by applying heat and pressure to a small, localized area. It works ... processes are efficient for mass production and can be automated, especially in industries like automotive manufacturing....

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Describe the working principle of a thyristor-operated dimmer with the help of a circuit diagram.

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Describe various types of self-excited DC generators with their circuit layout.

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With neat diagram explain synchronized UJT triggering circuit.

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Explain the operation of RC triggering circuit with neat diagram.

Explain the operation of RC triggering circuit with neat diagram.
Answer : An **RC triggering circuit** is commonly used in electronic circuits like oscillators, timers, and waveform generators. It uses a resistor (R) and capacitor (C) in combination to create ... the resistor and capacitor can be adjusted to fine-tune the timing characteristics for specific applications....

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